2400 + 775 + 500
     1570.5 - 392.625
    1570.5 × 25%
    arctan(3.27/16.77)
    arctan(5/4)
    arctan5/4
    (4+1.1+11+10+1.8+10+2.2+1.8+1.5+10+3.7+22+2.2+65+15+7.5+36+7.5+15+22) × 7
    10/(0.8*sqrt(1+(0.64/80)^2)*sqrt(1+(0.64/61)^2))
    (1.9×10^3-0.3×1448.2×10^3)/(0.9×0.44×300)
    0.4×1448.2×0.883
    (1.1×24.42×10^6)/266666.67
    (244.23×0.4)/4
    (244.23×0.4)/4
    976.9/4
    √(((8.47+45.67)/1.22)^2+〖20.30〗^2 )
    (95.2×10^3)/(710×8.4+754.4×7)
    (58.9×10^6)/1515609.26
    (58.9×10^6)/1289631.53
    (112.9×10^3)/5560.8
    (164.1×10^3-0.3×208.5×10^3)/(0.9×0.55×300)

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